Find the theoretically optimal fraction of capital to risk per trade, based on your win rate and payoff ratio.
Kelly % = W − (1−W)/R, where W is win probability (as a decimal) and R is the ratio of average win to average loss. Most practitioners use a fraction (e.g. half-Kelly) rather than the full amount, since full Kelly can be aggressive.
Educational tool only — not investment advice. Markets involve risk; past performance and illustrative math don't guarantee future results.